Pump



' June 24, 1930.

R. v. BINGHAM 1,766,591

PUMP

Filed Nov. 12, 1928 3 ism Patented June 24, 1930 5 STATES RANDOLPH V,J?lllxiii-IAIVI 0F PORTLAND, OREGON PUMP Application filed November 12, 1928.

My invention relates to pumps in general, and particularly to rotary pumps of the type used for maintaining a vacuum on the return pipes of steam heating systems, the object being to provide a pump oi this character with improved eiilciency. l accomplish this object by means of the construction illustrated in the accompanying drawing, which is a part of this application for Letters Patent, like characters of reference indicating like parts throughout the several views thereof, and in which:

Fig. 1 is a sectional elevation of a pump embodying my invention.

Fig. 2 is a transverse sectional elevation of the same.

The general design of the pump follows closely that of such pumps now well known in the art and widely used, having a cylin' 'drica-l casing 3 with a shaft 4: eccentrically mounted therein. Secured upon said shaft is a rotor composed of a hub 5, arms 6 and rim 7. Integral with said rim are a plurality of blades 8. Due to the eccentric mounting of the shaft l these blades are in contact with the periphery of the casing during a portion of their revolution, and the remainder thereof the blades are spaced away from the casing, as shown in Fig. 2. Thus pockets are formed between the blades and the casing, which pockets are closed when the blades contact with the casing, and open otherwise. Liquid is provided within the casing, which liquid, under centrifugal force, is disposed around the interior of the casing in the form of an annular ring. The thickness of this ring of liquid is such that the ends of the blades 8 are always immersed therein, as also shown in Fig. 2.

An intake port 9 is provided upon the easing, which is placed in communication with the return pipes of the steam heating system. Exhaust ports 10 are provided in the casing heads, and these exhaust ports are in comunication by a passage 11 shown in Fig. 2.

The inner edges of the blades 8 are in contact with internal annular hollow rings 13, stationarily mounted within the casing. The interiors of said rings communicate re- Serial No. 318,?35.

spectively with the ports 10, and also the rings are ported upon their outer periphery as shown at 1 k in Fig. 2, said ports 14: opening into the rotor pockets when the pockets are in the positions where their inclosing w blades contact with the casing.

The gas from the return pipe of theheating system enters the pump at the intake port 9 and passing through the ring of liquid enters the rotor pockets, as shown by the arrows in Fig. 2. As the rotor revolves the liquid enters further and further into the rotor pockets thus compressing the gas therein, until as the pockets arrive at the point adjacent the port let in the internal rings 13 the gas enters these rings, from which it passes out of the exhaust ports 10.

In many pumps of this character there is a rotating film of liquid within the internal rings 13 through which film the gas must be forced as it enters the port l i, thus consuming power and lowering the efficiency of the pump. But by my construction I eliminate such rotating film of liquid because such liquid as passes along with the gas does not come in contact with any part of the rotor after it leaves the pockets thereof, but on the contrary passes out of the exhaust ports 10 with the gas. This is one element of my invention by which I increase the efiiciency.

The rotating film of liquid mentioned above as disposed within the internal rings in pumps heretofore used was a seemingly necessary evil because it is necessary to seal the rotor pockets from the interior chamber of the pump. 1 also seal the pockets from the chamber within the interior ring 13, but I do so by a body of liquid which is removed from the path of the gas being further increasing the eihciency of the pump by reason of not having to force the gas through a ring or liquid as it leaves the rotor tl rough the port To accomplish this sealing I lead the exhaust from the ports 10 into a separator 20 which separates the gas from the liquid that may be traveling with it. The liberated gas passes from the separator byway of pipe 21, and the liquid by way of pipe 22.

pumped, thus The pipe 22 communicates with the interior chamber of the pump within the internal ring 13, and at the bottom of said chamher, as shown in Fig. 1. At the top of said chamber a discharge pipe 23 is provided through which the liquid within the chamber is withdrawn therefrom by a water pump for the purpose of being returned to the system boiler. The pipe 23 is positioned above the inner peripheral surface of the internal ring 13, and as a consequence the liquid within the inner chamber completely fills said rings and thus seals the rotor pockets from the internal chamber. This is illustrated in Fig. 1, where one of the internal rings 13 is shown chamfered away at the pipe 23.

The feature of my invention is that I seal the rotor pockets from the inner chamber of the pump by static liquid, and that I eliminate the rotatin r film of sealing liquid and give the gas a ree passage from the rotor pockets to the exhaust port of the pump.

My invention may be made of any size, and constructed of any materials deemed convenient and suitable for a device of this character, and while I have illustrated and described a form of construction and arrangement of parts found desirable in materializing my invention, I wish to include in this application all mechanical equivalents and substitutes that may fairly be considered to come within the scope and purview of my invention as defined in the appended claims.

Having disclosed my invention so that others may be enabled to construct and to use the same, what I claim as new and desire to secure by Letters Patent is:

1. In a rotary pump: a casing having exhaust and intake ports; a pocketed rotor within said casing; a ring of liquid upon the inner surface or said casing and coopcrating with said pockets to compress gas therein; a chamber within said rotor independent of said pockets; and a body of liqnid within said chamber to seal the chamber from the rotor pockets.

2. In a rotary pump: a rotor; pockets upon said rotor, an inner chamber, with exhaust and intake ports and a body of liquid to seal said chamber from said pockets in combination with a casing having a ring of liquid upon its inner surface coacting with said pockets to compress gas therein.

3. In a rotary pump: a casing having exhaust and intake ports; a rotor; blades upon said rotor forming pockets therebetween; a ring of liquid within said casing coacting with said pockets; stationary annular hollow rings within said rotor and contacting with the inner edges of said blades, the hollow portion of said rings being in communica tion with said exhaust port, and also with said pockets at certain points of their revolution and a liquid within the interior chamber formed by said rings to seal said chamber from said pockets.

4. In a pump having a casing with a ring of liquid upon the inner surface thereof: a plurality of moving pockets in communication with said. ring of liquid ;,and a body of liquid, independent of said ring of liquid, acting as a seal between said pockets and the interior of said casin In witness whereo I claim the foregoing as my own I hereunto aflix my signature at Portland, county of Multnoniah, State of Oregon, this 25th day of Sept, 1928.

RANDOLPH v. BINGHAM. 

